Table A1.

Brief overview of diagnostic criteria for the internet gaming disorder (IGD).

Label	Criterion
A.	Mental preoccupation with gaming
B.	Withdrawal symptoms
C.	Tolerance/increase of dosage (gaming time)
D.	Failures to gain gaming control
E.	Loss of previous interests or prior hobbies
F.	Continuation of gaming despite insight into adverse consequences
G.	Lying to significant others in respect of factual gaming
H.	Gaming in order to regulate negative moods (‘escape’)
I.	Elevated risk of losing an important social relationship (job/education)

Notes. For assuming an IGD, a person’s gaming behavior must have matched at least 5 out of these 9 criteria in the past 12 months. See details in APA [11].